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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.camera.app;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.provider.Settings;
import android.util.Log;
import android.view.OrientationEventListener;
import android.view.Surface;
import com.android.camera.util.ApiHelper;
public class OrientationManager {
private static final String TAG = "CAM_OrientationManager";
// Orientation hysteresis amount used in rounding, in degrees
private static final int ORIENTATION_HYSTERESIS = 5;
private Activity mActivity;
private MyOrientationEventListener mOrientationListener;
public OrientationManager(Activity activity) {
mActivity = activity;
mOrientationListener = new MyOrientationEventListener(activity);
}
public void resume() {
ContentResolver resolver = mActivity.getContentResolver();
mOrientationListener.enable();
}
public void pause() {
mOrientationListener.disable();
}
private int calculateCurrentScreenOrientation() {
int displayRotation = getDisplayRotation();
// Display rotation >= 180 means we need to use the REVERSE landscape/portrait
boolean standard = displayRotation < 180;
if (mActivity.getResources().getConfiguration().orientation
== Configuration.ORIENTATION_LANDSCAPE) {
return standard
? ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE
: ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
} else {
if (displayRotation == 90 || displayRotation == 270) {
// If displayRotation = 90 or 270 then we are on a landscape
// device. On landscape devices, portrait is a 90 degree
// clockwise rotation from landscape, so we need
// to flip which portrait we pick as display rotation is counter clockwise
standard = !standard;
}
return standard
? ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
: ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;
}
}
// This listens to the device orientation, so we can update the compensation.
private class MyOrientationEventListener extends OrientationEventListener {
public MyOrientationEventListener(Context context) {
super(context);
}
@Override
public void onOrientationChanged(int orientation) {
// We keep the last known orientation. So if the user first orient
// the camera then point the camera to floor or sky, we still have
// the correct orientation.
if (orientation == ORIENTATION_UNKNOWN) return;
orientation = roundOrientation(orientation, 0);
}
}
public int getDisplayRotation() {
return getDisplayRotation(mActivity);
}
public int getCompensation() {
return 0;
}
private static int roundOrientation(int orientation, int orientationHistory) {
boolean changeOrientation = false;
if (orientationHistory == OrientationEventListener.ORIENTATION_UNKNOWN) {
changeOrientation = true;
} else {
int dist = Math.abs(orientation - orientationHistory);
dist = Math.min(dist, 360 - dist);
changeOrientation = (dist >= 45 + ORIENTATION_HYSTERESIS);
}
if (changeOrientation) {
return ((orientation + 45) / 90 * 90) % 360;
}
return orientationHistory;
}
private static int getDisplayRotation(Activity activity) {
int rotation = activity.getWindowManager().getDefaultDisplay()
.getRotation();
switch (rotation) {
case Surface.ROTATION_0: return 0;
case Surface.ROTATION_90: return 90;
case Surface.ROTATION_180: return 180;
case Surface.ROTATION_270: return 270;
}
return 0;
}
}
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